Design of Universal Code Generator for Multi-Constellation Multi-Frequency GNSS Receiver
, Taibin Liu 1, Wei Jiang 1,2,3, Jian Wang 1,2,3, Baigen Cai 1,2,3, Linguo Chai 1,2,3 and Kun Liang 1,2,3Round 1
Reviewer 1 Report
Comments and Suggestions for AuthorsThis paper proposes a universal code generator structure for multi-constellation, multi-frequency GNSS receivers, incorporating the code generator of existing GNSS based on the recently announced Indian Regional Navigation Satellite System (IRNSS), specifically IZ4. While the inclusion of IRNSS in the first implementation of a universal code generator is acknowledged and praised, there is a need for further enhancement in the experimental results.
The main reason for utilizing a universal code generator is to reduce hardware complexity. Therefore, the experimental results should not only demonstrate the effectiveness of the proposed universal code generator but also include comparisons from a hardware implementation perspective with both existing universal codes and individually designed code generators. Such comparisons are crucial to validate the claims of the paper and to illustrate the specific advantages of the proposed structure in reducing hardware complexity.
Comments on the Quality of English Language
This paper proposes a universal code generator structure for multi-constellation, multi-frequency GNSS receivers, incorporating the code generator of existing GNSS based on the recently announced Indian Regional Navigation Satellite System (IRNSS), specifically IZ4. While the inclusion of IRNSS in the first implementation of a universal code generator is acknowledged and praised, there is a need for further enhancement in the experimental results.
The main reason for utilizing a universal code generator is to reduce hardware complexity. Therefore, the experimental results should not only demonstrate the effectiveness of the proposed universal code generator but also include comparisons from a hardware implementation perspective with both existing universal codes and individually designed code generators. Such comparisons are crucial to validate the claims of the paper and to illustrate the specific advantages of the proposed structure in reducing hardware complexity.
Author Response
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Author Response File: 
Author Response.pdf
Reviewer 2 Report
Comments and Suggestions for AuthorsThis study introduces a code generator rooted in the hardware structure of the IRNSS IZ4 code generator, establishing compatibility with all Linear Feedback Shift Register (LFSR)-based spread-spectrum codes for GNSS, encompassing the IZ4. The manuscript is well-crafted and offers substantial insights. Nevertheless, a few minor points warrant consideration:
- While the paper adeptly showcases Xilinx simulations, a critical aspect remains unexplored – the real-world performance of the proposed code generator. Addressing this could enhance the practical relevance of the study in navigation applications.
- It would be beneficial to elucidate if the universal code generator exhibits superior performance in specific environmental conditions or situations compared to existing solutions. This clarification could highlight potential advantages and applications.
- The identification and mitigation of potential barriers to the widespread adoption of a universal code generator represent crucial aspects. Discussing strategies to address these barriers would strengthen the practical implications of the proposed solution.
- Instances of undefined references appear on lines 321 and 330, requiring correction.
- The caption of Table 5 should provide an informative description of the table's content.
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
